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Examples
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A major use of water based fluids is in longwall mining roof supports, where HFA (5/95) fluids are generally used.
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Among its findings: A water-spray system that helps suppress explosive coal dust wasn't functioning properly, and sparks from worn carbide bits on a piece of equipment known as a longwall shearer likely ignited gases that had reached explosive levels.
Series of Errors Cited in Coal-Mine Explosion Kris Maher 2011
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It said Resource Pacific has missed its own forecast for restarting so-called longwall mining operations three times over the past four months, while the forecast production is more than three times the five-year average production rates for Australian mines with coal seams comparable to Resource Pacific's Newpac mine in New South Wales's Hunter Valley.
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That technique, known as longwall mining, now produces some 40 percent of all coal from U.S. underground mines, up from 5 percent in 1980, according to federal statistics.
NYT > Home Page By MANUEL QUINONES of Greenwire 2011
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The bulk of the coal is removed with machine called a longwall miner that uses a cutting head to move back and forth across the working face somewhat like a 1,000-foot-long deli slicer.
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A bulk of the coal is removed with a machine called a longwall miner that uses a cutting head to move back and forth across the working face somewhat like a 1,000-foot-long deli slicer.
KDKA - Pittsburgh's Source for Breaking News, Weather and Sports 2010
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The bulk of the coal is removed with machine called a longwall miner that uses a cutting head to move back and forth across the working face somewhat like a 1,000-foot-long deli slicer.
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A bulk of the coal is removed with a machine called a longwall miner that uses a cutting head to move back and forth across the working face somewhat like a 1,000-foot-long deli slicer.
KDKA - Pittsburgh's Source for Breaking News, Weather and Sports 2010
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The bulk of the coal is removed with machine called a longwall miner that uses a cutting head to move back and forth across the working face somewhat like a 1,000-foot-long deli slicer.
Sports Station 2010
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The bulk of the coal is removed with machine called a longwall miner that uses a cutting head to move back and forth across the working face somewhat like a 1,000-foot-long deli slicer.
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